丝电爆制备纳米颗粒的电参数对能量沉积的影响

丝电爆过程中的能量沉积直接关系到所制备的纳米颗粒的粒径分布.为研究电参数对此过程中能量沉积的影响,通过改变电极类型与气隙长度进行丝电爆实验,实验中使用高采样率的示波器采集电压电流波形,并对金属丝沉积能量与制备的纳米颗粒的粒径分布进行分析.研究结果表明:丝电爆电流中存在幅值很高的谐波成分,谐波沉积能量对金属丝总沉积能量有贡献,并能够影响所制备的纳米颗粒的平均粒径.在两类电极之间,谐波沉积能量占比与总沉积能量在使用平行电极时多于使用同轴电极时,缩短放电气隙能够减少谐波沉积能量占比和总沉积能量.使用平行电极制备的纳米颗粒的平均粒径较小,说明此条件下总沉积能量增多.

Effects of electrical parameters on energy deposition of nanoparticles preparation by wire electrical explosion

The energy deposition in the process of wire electrical explosion is directly related to the particle size distribution of prepared nanoparticles. In order to study the influence of electrical parameters on energy deposition, the electrode types and air gap lengths were adjusted to carry out the wire electrical explosion experiment. In the experiment, a high sampling rate oscilloscope was used to collect the voltage and current waveforms, and the deposition energy of the alloy wire and the particle size distribution of the prepared nanoparticles were analyzed. The results indicate that there is a harmonic component with high amplitude in the wire explosion current, and the harmonic deposition energy contributes to the total deposition energy of the wire, which can affect the average particle size of the prepared nanoparticles.Between the two types of electrodes, the ratio of harmonic deposition energy to total deposition energy is higher when parallel electrodes are used than when coaxial electrodes are used. Shortening the discharge air gap can reduce the ratio of harmonic deposition energy and reduce total deposition energy also. Investigations to particle size distribution show that the average particle size of the nanoparticles prepared by parallel electrodes is smaller, which further indicates that the total deposition energy increases in this condition.